San Mateo Campground (within San Onofre State Beach) lies a short distance inland from the 3.5-miles of sandy beaches within San Onofre State Beach. A 1.5-mile Nature Trail connects the campground to Trestles Beach, a world class surfing site. San Mateo Creek flows just east of the campground outward towards the ocean creating key riparian and wetland habitats which host some rare and even endangered species. All campsites include a fire pit and picnic table. Hookup sites are available with electricity and water. Other amenities include a dump-station, hot indoor showers, and flush toilets. Camping is available year-round.